Hot-air-furnace construction



Mar. 27, 1923.

W. J. JOHNSON.

HOT AIR FURNACE CONSTRUCTION.

2 SHEETS-SHEET 1.

Patented Mar. 27', 1923.

warren sr'rs 3 wEsLEY J; Jorinson, or DE Katie, ILLINois, ASSIGNOR T0STANDARD FOUNDRY"&

MEG. COMPANY, or DE KALB, ILLINOIS, A CORPORATION F ILLINOIS.

HOT-AIR-FURNACE CONSTRUCTION.

Application filed May 19,

T 0 (LZZ whom it may concern:

, Be it known that I, iVEsLEY J. JOHNSO a citizen of the United States,residing at De Kalb, in the county of De Kalb and State of Illinois,have invented certain new and useful Improvements in Hot-Air-FurnaceConstructions, of which the following is a specification. I i i Thisinvention relates to hotair furnace construction, and especially to theconstruction and arrangement of the body portion or' combustion chamberthereof. Among the ob ects of m'yjinvention is to provide a furnace bodyor combustion chamber of such shape and arrangement as to effect-athorough commmgling and mixing together of the gases and producesubstantially com-u plete combustion thereof; further to so constructthe combustion chamber th at the gases as they move upwardly will be.successively thrown inwardly in rotative'move- 'ment, such movementincreasing as the'top is approached; further-to s0 throw the gases backupon themselves that not only will they more thoroughly commingle andmix together, but their upward movement will be sufficiently retarded toprevent the escape of a large volume of unburned gases from the top ofthe combustion chamber; further to produce a simple,GCO'IIOIIIICtLlaIlCl eflicacious combustion chamber for hot airfurnaces;

and such further objects, advantages and capabilities as will later morefully become apparent.

My invention further resides in the combination, construction andarrangement of tion Orr-combustion chamber embodying my partsillustrated in the accompanying-drawings, and while I have shown thereina preferred embodiment, I desire the sameto be understood ;asillustrative only, and not as limiting the scope of my.invention.

In the drawings i i i I Fig. 1 is an elevation of a furnaceembodying myinvention,jparts of the casing walls and lining being broken away toshow the interior parts in elevation.

Fig. 2 isa perspective view of a body por invention; p v

Fig, *3 is an enlarged planview of Fig. 2, a portionof the fuel chutebeing broken away to conserve space.v

1921. Serial No. 470,780. 7

Fig. 4 is a section on the line l of I Fig. 3. a

Referring ticul-arly 'Fig. l, my furnaceiis designated outer walls 1,and lining 2, spaced in the usual mannerv from the fire pot 3 L1l(lcombustion chamber 4. Extending forwardly from the combustion chamber isthe fuel chute 5, while as shown, the upper end of the combustionchamber connects with the radiator 5', from which the gases areconducted; away in flue 6. I j i Since my invention resides primarily inthe usual .manner. through the body'portion or-combustion chamber 4:,

to the drawings, and. more par- Q [generally at A, and comprises theusual;

the same will now be described in detail. I

This combustion" chamber or body portion is formed at-its lower edgewith the flanges v7 and S to cooperate in the usual manner with the firepot, to effect a joint therewith, .The combustion chamber propercomprises the wall 9, converging upwardlytowards its top 10, whichlatter is formed with the usual.

to form a jointtherewith Aswill be seen from Fig.- 4, thewall 9 of thecombustion projections of successively increasing dimens1on. whichfunction to oause the upwardly moving gases to besuccessively thrown ingroove 11 to cooperate with the radiator 5'5 rotative movement towardthe interior of the combustion chamber. a The upwardly moving gases willfirst strike" the curved ridge or projection 12, resulting in the gasesbeing slightly throwninwardly in rotat'ive I movement; As theygases'continue upwardly their tendency for expansion will cause them tofill circumferential depression--13 (orfin,

other words the valley of the corrugation), after which they will strikethe inwardly curved ridge or projection 14, which projects inwardly agreater extent thanflridge 12, and the gases will againfbe thrownvinwardly with a rotative movement to a -greater-degree than in thecaseof their contact with ridge 12. Continuing upwardly the'gases will beexpanded or otherwise crowded into the curved depression 15, and finallyagain thrown inwardly from the inwardly projecting ridge 16, which dueto the greater width from ridge 14 to ridge 16, as compared with ridges12 and M, the rotative movement at this point will be greater than thatdescribed in connection with ridges 12 and 14, and will result in thegreater portion of the gases being curled inwardly upon themselves inrotative move ment, and thrown towards the center of the combustionchamber. From this it will be seen that the gases are thrown inwardly inrotative movement successively, which causes the gases to be thoroughlymixed to produce complete combustion. This movement also prevents theescape from the upper openendof the combustion chamber of a largequantity of unburned gases, and crowds and holds them within thecombustion chamber much more completely than if the gases were permittedto merely ascend more or less uniformly from the bottom to the top ofthe combustion chamber.

Suitably spaced around the exterior of wall 9, are a plurality of ribs17 increasing gradually in thickness toward the upper end ,as shown inFig. 4, which not only strengthens the combustion chamber wall, but alsofunctions to prevent injury from unequal expansion of the diiferentparts of the wall.

This breaking up of the gases and causing them to curl inwardly inrotative movement a plurality of times during their movement upwardlythrough the combustion chamber, is a very important improvement overthose types of combustion chamber in which the gases are curled inwardlyonly at the top, since as will be readily appreciated, there will be amuch more thorough intermixing of the gases each time they are curledinwardly, and when this is done successively, the mixing of the gasesand the combustion thereof is substantially complete before they leavethe combustion chamber. It is also important to note the two short ribs18 extending between the top of fuel chute 5 and the top of thecombustion chamber.

Having now described my invention, I claim 1. In furnace construction,upper and lower body members, said upper member having an open lower endportion, an upper end portion of smaller size than said lower endportion, and a wall connecting said end portions, said wall being formedwith a series of undulations increasing in width upwardly and extendingalong a portion of the wall of said upper body member.

2. In furnace construction, a body member having an open lower endportion, an upper end portion of smaller size than in said lower endportion, a wall connecting said end portions, said wall being formedwith a series of undulations extending along a portion of said wall,said undulations increasing in width toward said upper end portion.

3. In furnace construction, a body member having an open lower endportion, an upper end portion of smaller size than said lower endportion, a. wall connecting said end portions, said wall being formedwith a series of undulations increasing in width upwardly and extendingalong a portion of said wall, and a plurality of circumferentiallyspaced upwardly extending ribs formed on the outer side of said wall andintersecting said undulations on said outer side.

4:. In furnace construction, a body member having an open lower endportion, an upper end portion of smaller size than said lower endportion, a wall connecting said end portions said wall being formed witha series of undulations increasing in width upwardly and extending alonga portion of said wall, and a plurality of circumferentially spacedupwardly extending ribs formed on the outerside of said wall andintersecting said undulations on said outer side, said ribs increasinggenerally in thickness toward said upper end portion.

5. In furnace construction, a body member comprising an upwardlytapering wall having the upper portion thereof formed with undulationsincreasing in curvature toward the upper end of said wall, the uppermostundulation serving to direct upwardly moving gases inwardly and over onthemselves to effect a substantially complete combustion thereof.

6. A combustion chamber for furnaces comprising an upwardly taperingcorrugated wall portion, the corrugations thereof being substantiallycircumferential of the chamber and increasing in width toward the upperend of said chamber to set up a series of rotative movements in thegases as they progress upwardly.

7. A combustion chamber for furnaces comprising an upwardly taperingwall hav ing the inner face of the upper portion of said wall formedwith circumferential ridges and grooves increasing in width toward theupper end of said wall for giving the upwardly moving gases a rotativemovement at each ridge and groove and for causing said gases to besuccessively thrown inwardly and back upon themselves to promotecomplete combustion of the gases.

8. A combustion chamber for furnaces comprising an upwardly taperingwall having the inner face of the upper portion of said wall formed withcircumferential ridges and grooves increasing in width toward the upperend of said wall for giving the upwardly moving gases a rotative movement at each ridge and groove and for causing said gases to besuccessively thrown inwardly and back upon themselves to-[promotecomplete combustion of the gases, and upwardly extending ribs on theoutside of said wall, said ribs increasing in thickness from the lowerto the upper ends thereof.

9. A combustion chamber for furnaces.

top of the chamber, whereby a thorough commingling of the gases isefi'ected' l0. In furnace construction; an upwardly taperingbody portionformed with a series of substantiallycircumferential undulationsprogressively increasing in size toward the v tapered end of said bodyportion. 7 11. In furnace construction, a chamber having afrusto-conoidalbody portionprovided with a series of substantiallycircumferential undulations progressing in sizeto ward the apex of saidbody portion.

12. In furnace constructlon, an upwardly tapering body portionformedwith vari sized circumferential undulations and circumferentiallyspaced downwardly tapering ribs. pp i 1 13. In a furnace construction,an upwardly tapering body portion formed with circumferentialundulations increasing in width upwardly.

In witness whereof; I hereunto subscribe my name to this specificationin the presence of .two witnesses.

Witnesses: I

P, SNOW, R. D. HUNT.

WESLEY J. Joi-mso v."

